SU1436061A1 - Ultrasonic shadow method of determining flaws in articles - Google Patents

Abstract

This invention relates to the field of acoustic non-destructive testing methods. The aim of the invention is to increase the information content by determining the location of defects smaller than the size of the receiving transducer due to measuring the intensity of the ultrasonic (UL) oscillations passing through the product at two points lying on the acoustic axis of the radiating transducer. The radiation and receiving transducers are coaxially installed in the intermediate phase opposite each other. Position the controlled product between the converters. Ultrasonic vibrations transmitted through the product are emitted and taken in, their intensity is measured. When a defect is detected, the receiving transducer is moved along the axis of the emitting transducer, the distance between the transducers is recorded, and the intensity of the received oscillations is measured again. Based on the measured intensity, taking into account the distance between the transducers, the distance between the emitter and the defect is determined. 1 il. F (l with

Description

four

SO About

oh oh

The invention relates to acoustic methods of non-uniform control and can be used for ultrasonic (US) inspection of various products.

The aim of the invention is to increase the information content by determining the location of defects smaller than the size of the receiving transducer by measuring the distance between the emitter and the receiving transducer during the test when a defect is detected.

The drawing shows a scheme for the ultrasonic testing of an ultrasonic method for monitoring product defects.

An UL Shadow way to monitor product defects is as follows.

In the intermediate medium, at a fixed distance from each other, the radiating and receiving transducers are installed, and a controlled product is placed between them. Ultrasonic vibrations are emitted, vibrations transmitted through the product are received, and the intensity of the received vibrations is measured. When a defect is detected, the receiving transducer is shifted in the direction coinciding with the acoustic axis of the transducers, and the intensity of the received oscillations is measured again. The distance X from the radiation transmitter to the defect is determined from the expression

X

, - It)

 1 - lo) - R, (II - lo)

where R and R are the distances between the converters before the displacement of the receiving converter}

1 (and Ij is the intensity of the received oscillations that have passed through the product with the defect, before and after the displacement;

TO intensity-received oscillations that have passed through the product without a defect.

The UL Shadow way of monitoring product defects is implemented in a skinny way.

Radiating 1 and receiving 2 converters are installed coaxially in

S

0 5 o

five

0

five

0

five

intermediate medium, such as Zionic fluid, at a distance R and RI from each other. Between the transducers 1 and 2, place the monolithic product 3 under control and scan it. During the scan, the transducer 1 is emitted and the ultrasound transducer 2 passes through the transducer 3, and its intensity is measured using the recording unit 4. When defect 5 is detected by decreasing the intensity, the value of I is fixed, last and the transducer 2 is moved along the direction of propagation of the ultrasonic vibrations so that the distance between the transducers 1 and 2 becomes equal to R. The intensity 1 is measured. The ultrasonic effects transmitted through the product 3, At this distance, the distance X between the transducer 1 and the defect 5 from the arming is determined.

,, RiRgdi - 1g)

 , - TO) - R, (l2 - lo)

where R, Rj is the distance between transducers 1 and 2 before and after moving transducer 2; Ij, Ij intensity of the received

oscillations that passed through the product 3 with defect 5; before and after moving converter 2; IP - received intensity

the oscillations that passed through the product 3 without a defect before and after moving the converter 2. Know the distance from the converter 1 to the surface of the tested product 3, determine the depth of the hall: - the sound of the defect 5.

Claims (1)

Invention Formula The ultrasonic shadow method for monitoring defects of products, which consists in coaxially emitting and receiving transducers in an intermediate medium at a fixed distance from each other, positioning the product between transducers, radiating and receiving the oscillations passed through the product, moving the receiving transducer relative to emitting (it measures the parameters of the received oscillations before and after the displacement and with their help determines the presence and location of the defect, characterized in that, with a twisted loop operability by determining the location of defects smaller than the size of the receiving transducer; moving the receiving transducer is carried out along the acoustic axis by a fixed distance; the intensities 1 and 12 of the received oscillations are measured before and after the displacement, and the distance X from the radiating transducer before the defect is determined from the pressure RtRi (Ii - 1g) R (l, - lo) - R, di- I.) one Rj is the distance between the radiating and receiving transducers before and after displacement; 1 - intensity of received oscillations passed through with a defect, before and after the displacement; IP is the intensity of received oscillations that pass through a product without a defect. g} uj